Data Sheet No. PD94129
IRU1150
4A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
DESCRIPTION
The IRU1150 is a 4A regulator with extremely low drop-
out voltage using a proprietary bipolar process that
achieves comparable equivalent on-resistance to that of
discrete MOSFETs. This product is specifically designed
to provide well regulated supply for applications requir-
ing 2.8V or lower voltages from 3.3V ATX power supplies
where high efficiency of a switcher can be achieved with-
out the cost and complexity associated with switching
regulators. One such application is the new graphic chip
sets that require anywhere from 2.4V to 2.7V supply
such as the Intel
I740
chip set.
FEATURES
0.7V Dropout at 4A
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
APPLICATIONS
3.3V to 2.7V Intel
I740
Chip Set
TYPICAL APPLICATION
3.3V
C1
100uF
V
IN
V
CTRL
5
4
3
2
1
R1
102
R2
118
C3
100uF
IRU1150
V
OUT
Adj
V
SENSE
2.7V
5V
C2
100uF
Figure 1 - Typical application of IRU1150 in a 3.3V to 2.7V for
I740
chip.
PACKAGE ORDER INFORMATION
T
J
(°C)
0 To 125
5-PIN PLASTIC
TO-263 (M)
IRU1150CM
5-PIN PLASTIC
Ultra Thin-Pak
TM
(P)
IRU1150CP
8-PIN PLASTIC
SOIC (S)
IRU1150CS
Rev. 1.6
03/18/02
www.irf.com
1
IRF [ INTERNATIONAL RECTIFIER ]
